Neil Lennon insists 'it just wasn't our season' as he reflected on the end of his Celtic reign.The Irishman has spoken publicly about his exit for the first time since resigning in the wake of a fatal defeat to Ross County in February.Lennon oversaw the capitulation of the club's 10 In A Row dream and Rangers have since wrapped up the Premiership title at their rivals' expense.But the club's former captain, the only man in its history to win a Treble as both a player and manager, has only fond